Viscometer



FIG. 1 is a left side elevational view of a viscometer showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a top and left front perspective view thereof. 

The ornamental design for a viscometer substantially, as shown and described. 